Today we honor the men and women who died in service to this country. The first official Memorial Day was held on May 5th in Waterloo, NY in 1866. Other places also claim to be the first but Waterloo is the official one. Originally called Decoration Day, you still hear that on occasion here in the South. People use that to decorate graves of loved ones beyond the original purpose of the day. May was chosen because the flowers are in full bloom. General Grant presided over the first large scale observance of Memorial Day in 1873 when 5,000 people attended at Arlington.